emerge -uvD world error

i will assume you are using 'gentoo-sources' so simply

Code:

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emerge -u gentoo-sources

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or whatever sources you are using then either cp the .config from your existing kenel and then

Code:

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make menuconfig > exit > save yes

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and then cp it to boot as listed in the handbook as linked below
or simply make the kernel from scratch and continue with the handbook from here http://www.gentoo.org/doc/en/handboo...ap=7#doc_chap3

P.S. in the future please start a new thread for a new question